//适配移动端函数
(function (doc, win) {
    var docEl = doc.documentElement,
    resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
    recalc = function () {
    var clientWidth = docEl.clientWidth;
    if (!clientWidth) return;
    if (clientWidth >= 750) {
    docEl.style.fontSize = '100px';
    } else {
    docEl.style.fontSize = 100 * (clientWidth / 750) + 'px';
    }
    };
    if (!doc.addEventListener) return;
    win.addEventListener(resizeEvt, recalc, false);
    doc.addEventListener('DOMContentLoaded', recalc, false);
})(document, window);
